Detachable cutter blade pile wire



June 16, 1936. Q jf plcKARD A2,044,632

DETACHABLE CUTTER BLADE PILE WIRE Filed Feb. sa,I 1934 Patented .lune 16, 1936 ETE STATES AT E 'i' OFFIE 2 Claims.

This invention relates to improvements in pile wires having detachable cutter blades, being a continuation in part of my application for patent filed Jan. 27, 1934, Serial Number 708,656, and the principal object of the invention is to provide simplified and positive means for retaining the blade in its normal working position in the wire and facilitating insertion and withdrawal of the blades.

Another object is to provide a novel pile wire construction having auxiliary cutting means preventing damage to the fabric in event of displacement or breaking of the primary cutting blade.

The invention further resides in certain novel structural details hereinafter set forth and illustrated in the attached drawing, in which:

Figure 1 is a side elevational view of a wire and blade assembly made in accordance with my invention;

Fig. 2 is a fragmentary view in perspective of the blade-holding end of the pile wire;

Fig. 3 is a side view of an element of the pile wire shown in Figs. 1 and 2;

Fig. 4 is a View in perspective of the detachable cutting blade, and

Fig. 5 is a fragmentary side elevation of a pile wire illustrating a modification within the scope of the invention.

With reference to Figs. 1 to 4 of the drawing, the body of the pile wire is designated by the reference numeral I. As illustrated, the wire is provided at one end with a longitudinally recessed enlarged head portion 2, and the upper and lower edges of the recess 6 of this head portion, together with the adjoining upper edge of the body of the wire, are provided with slots, 3 and 4 respectively, for reception of a primary cutting blade shown in perspective in Fig. 4 and designated by the reference numeral 5. The inner ends of the slots 3 and 4 terminate at points short of the inner end of the recess 6 so that when the blade is inserted as shown irrFig. 1, an opening 'l is provided into which may be inserted a suitable tool for dislodging the blade from the slots. The slots 3 and 4 and the blade 5 are so formed that when the blade is fully inserted as shown in Fig. 1, the blade is held positively in its normal operative position as shown, and can be withdrawn from the slot only by a movement parallel to the wire. The outer end of the slot 3, however, is made relatively deep so that when the blade 5 is partially withdrawn, it may be tilted upwardly at its outer end from the slot 4, as indicated in broken lines in Fig. 1, and may thereby readily be withdrawn from the wire. It will be noted that when the blade is in its normal operative position, it is positively held by means embracing both the upper and lower edges of the blade and a portion of the sides thereof, so that accidental displacement of the blade is precluded, and in the operation of the pile wire the pressure of the yarn against the cutting edge of the blade is in a direction tending to force the blade into the socket formed by the oppositely arranged slots 3 and 4.

In the present instance, the head portion of the pile wire comprises three sections 8, 9, and l0 secured together face to face to provide the slotted construction described above. The intermediate or filler member l0 shown in Fig. 3 has a portion Il which is exposed at the inner end of the slot l, as shown in Figs. 1 and 2, and this exposed portion l i is sharpened to afford an auxiliary cutting edge. This edge becomes operative in the event of accidental displacement of the primary blade 5, and by performing the function of the latter prevents damage to the fabric.

In Fig. 4, I have illustrated a modification in which the terminal end of the wire receiving the blade is made in eifect solid, and is slotted in extension of the slot 4a. in the upper edge of the wire la to receive the end of the primary cutting blade. In this instance, a slotted opening I2 is provided in the end of the wire which intersects the inner end of the blade-receiving slot, this opening providing for insertion of a suitable tool to displace the blade from the slot when replacement is necessary. To alford an auxiliary cutting edge corresponding to the edge Il of the previously described embodiment, the forward edges I3 of the enlarged head portion 2a are sharpened, and these cutting edges, in the event of accidental displacement of the primary blade 5, temporarily perform the functions of the latter and prevent damage to the fabric.

It will be apparent that the invention in principle is capable of further modification without departure from the invention as defined in the appended claims.

I claim:

1. A pile wire comprising an enlarged head portion having a recess extending from the inner side thereof, said head being formed of three plates secured together in face-to-face relation, slots in the upper and lower edges of said recess for reception of a primary cutting blade, the bottoms and sides of said slots being defined by the intermediate of said plates and the outer plates respectively, and an auxiliary cutting edge formed on the said intermediate plate and exposed at the inner end of said recess, said edge being operative in the event of displacement from said slots of the primary cutting blade.

2. The combination of a pile wire having an enlarged substantially rigid head portion, the body of the wire adjoining the head having a slot in its upper edge for the reception of a cutting blade, said head portion having at its inner edge a recess for reception of one end of said cutting blade, the sidewalls of said recess form- 

